I thought out of the three Solar did the highest base melee damage while also scorching targets. Now if I'm not mistaken it can oneshot someone with really low resilience, my strategy is to run a 120 HC to drop a shield first and then I can nuke one guy and zap another two with Dunemarchers which are easily finished by either the Hand Cannon or my Grenade Launcher. I only ever use a Sunbreaker, some might call it the suicide-build, I call it the Demolitions/Sapper. For solid 100% OHK make sure to use the Peregrine Greaves, if you use them they are fun but you do get shotgunned often. One time on Exodus Blue I ran for the heavy ammo and an enemy hunter ran out in front of me so I hit melee and smacked him with the hammer so hard he actually got launched off the edge and died because of how far I launched him, I sat there and laughed maniacally for a moment. [i]What if everything you ever wanted...[/i] [spoiler] ...WAS TO KICK PEOPLE IN THE FACE!? FOREVER! THEN YOU NEED PEREGRINE GREAVES!!! PUT THESE SWEET--blam!- LEGS ON YOUR TITAN AND YOU WILL DECIMATE THINGS WITH YOUR POWERFUL KNEES. THEY ARE GEMS. YOU WILL LOOK GLAMOROUS LIKE A STYLISH LADY WHILE YOU KNEE SOMEONE IN THE THROAT SO HARD THEIR TEETH GO FLYING OUT OF THEIR BACKSIDE! YOUR LEGS ARE BEDAZZLED! BEDAZZLED WITH THE STRENGTH OF 1,000 KODIAK BEARS IF KODIAK BEARS GAVE ZERO CRAPS ABOUT GRAVITY AND EVOLVED TO DO SWEET JUMPKICKS! YOU WILL SET YOUR CHILD ON YOUR KNEE TO GIVE HIM SOUND FATHERLY ADVICE AND THAT CHILD WILL EXPLODE BECAUSE YOUR KNEES ARE INSTANT DEATH! YOUR SON WILL DIE! YOUR WIFE WILL DIVORCE YOU! YOU WILL DIE ALONE ATOP THE MOUNTAIN OF CORPSES YOU'VE LEFT IN YOUR WAKE AS YOUR LIFE DISSOLVES INTO A NIGHTMARISH HELLSCAPE OF VIOLENCE AND DEPRAVITY! YOU WILL TAKE PEREGRINE GREAVES INTO THE CRUCIBLE AND YOU WILL MASSACRE PEOPLE! YOU WILL KNEE BLADEDANCERS! DENIED! GET THAT BUTTERKNIFE THE HEACK OUT OF HERE! YOU WILL KNEE RADIANT WARLOCKS AND CAUSE THEM TO WEEP RADIANT TEARS! YOU WILL KNEE GOLDEN GUNSLINGERS...CAREFULLY.... YOU WILL KNEE OTHER TITANS IN THEIR BUBBLES, DIVING INTO THEIR NEON DISCO DANCE PARTIES BLIND AS STUFF AND MURDERING THEM WITH YOUR ENERGY LEGS! IT IS YOUR BUBBLE NOW SO FORGET THAT GU---wait, crap...THE BUBBLE IS GONE BECAUSE OF YOU GOSH DARN IT WHY THE HEACK DID YOU DO THAT!? YOU WILL RUIN YOUR K/D LIKE I HAVE BECAUSE YOU ARE ADDICTED TO THE SWEET, SWEET SOUND OF INSTANT AIRBORNE DEATH! YOU WILL CATCH SO MANY SHOTGUN BLASTS TO THE FACE AND IT WILL BE WORTH IT WHEN YOU KNOCK A BLADEDANCER THE HEACK OUT BEFORE HE CAN CHOP UP YOUR TEAM! EVERY PAINFUL DEATH WILL BE VALIDATED AS YOUR LEG COLLIDES WITH A FIERY WARLOCK'S GOFFY GOAT HAT SO HARD THAT HE'S RENDERED BRAIN-DAMAGED!!! [/spoiler]

Insurmountable Skullfort should work for Hammer Strike and Shield Bash too. That thing needs a big buff after arc 3.0.

Hammer strike instantly ignites killed enemies. Use ember of torches to get a 25% damage boost to replace the debuff. Use the sunspot aspect to get a restoring sunspot after killing the target.